CN217440457U - Mounting structure of table foot - Google Patents

Abstract

The utility model discloses a mounting structure of table legs, belonging to the technical field of fastening devices, comprising a joint with a connecting part, wherein the connecting part is fixedly connected with a plurality of pins, and the side wall of the connecting part is provided with pin holes; the end opening of the cross beam is sleeved on the connecting part, a limiting pin is arranged on the cross beam close to the end opening, first threaded holes are respectively formed in two end faces of the limiting pin, limiting holes are further formed in the side wall of the limiting pin and correspond to the pin, and the first threaded holes are communicated with the limiting holes; when the cross beam is connected with the joint, the pin extends into the limiting hole of the limiting pin, the pin hole in the pin is arranged right opposite to the first threaded hole, and the pin further comprises a set screw, and the set screw is screwed in from the first threaded hole from outside to inside and is mutually clamped and embedded with the pin hole of the pin. The joints are connected with the foot tubes and the cross beams respectively, so that flexible installation and disassembly of the cross beams and the foot tubes can be realized, the space occupancy rate is saved, and the transfer and storage capacity is greatly improved.

Description

Mounting structure of table foot

Technical Field

The utility model belongs to the technical field of fastener, concretely relates to mounting structure of table foot.

Background

In our daily life, tables are ubiquitous. The table occupies an indispensable position whether being used as office supplies or being used at home. The table mainly comprises a support and a table plate, the support generally comprises table legs and a cross beam, the table legs are in direct contact with the ground, and the two ends of the cross beam are connected with the table legs to support the table plate, so that the integral stability of the table is ensured.

At present, the mounting structure of table foot on the market mainly divide into two kinds: integrated and split types. The table legs and the cross beams are integrally formed, the structure is stable, but the cross beams and the table legs cannot be detached, the occupied space is large, and the storage and the transportation are not facilitated; the desk legs and the cross beams can be flexibly disassembled and assembled in a split mode, and the desk legs and the cross beams occupy small space and are convenient to package and transport compared with the desk legs and the cross beams, so that the desk legs and the cross beams are widely applied. But split type structure is complicated, and the dismouting process is more time-consuming and laborious, and among the prior art, chinese patent like publication number CN201691338U provides a table foot connecting device, including the table foot, the table foot open and to have half a hole, half downthehole cooperation sets up rivet nut, the table foot in open and to have a through-hole, the through-hole fit sets up the step screw, the path one end of step screw is worn out the table foot outside, with rivet nut mesh connect. The table leg connecting device solves the problem of connection of the table legs to a certain extent, but has higher manufacturing cost and poorer economic benefit; in addition, the connection parts are not flexible and convenient to assemble and disassemble, the fasteners are exposed on the surfaces of the table legs, the integrity and the attractiveness of the table are damaged, and the mounting structure of the table legs needs to be further improved.

Therefore, in order to solve the problems in the prior art, it is urgently needed to provide a table leg mounting structure which is simple in structure, reliable in connection and low in manufacturing cost.

Disclosure of Invention

To the problem in the correlation technique, the utility model provides a mounting structure of table foot to overcome the above-mentioned technical problem that current correlation technique exists.

The technical scheme of the utility model is realized like this: a mounting structure of table legs comprises joints which are respectively connected with leg tubes and a cross beam,

the joint comprises a main body and a connecting part arranged on the end face of the main body, wherein a plurality of pins are fixedly connected to the connecting part, the pins extend outwards along the axial direction of the pins, and pin holes are formed in the side wall of the extending part of the pins;

the end opening of the cross beam is sleeved on the connecting part, a limiting pin is arranged at the end opening of the cross beam, two ends of the limiting pin respectively penetrate through the side surface of the cross beam, first threaded holes are formed in the two end surfaces of the limiting pin respectively, a plurality of limiting holes are further formed in the side wall of the limiting pin and correspond to the pin pins, and the first threaded holes are communicated with the limiting holes;

when the cross beam is connected with the joint, the pin extends into the limiting hole of the limiting pin, the pin hole in the pin is arranged right opposite to the first threaded hole, and the pin further comprises a set screw, and the set screw is screwed in from the first threaded hole from outside to inside and is mutually clamped and embedded with the pin hole of the pin.

The utility model discloses in, connect respectively with foot pipe, crossbeam through setting up, can realize the nimble installation and the dismantlement of crossbeam and foot pipe, save space occupancy, promote greatly and transport storage capacity.

As a further improvement of the above scheme, the device further comprises a longitudinal beam, wherein a plurality of second threaded holes penetrating through the side surface are formed in the transverse beam, and the longitudinal beam is fixedly connected with the second threaded holes of the transverse beam through screws; and part of the second threaded holes simultaneously penetrate through the side wall of the limiting pin, and screws extending into the part of the second threaded holes are in threaded connection with the limiting pin.

The wall thickness of the cross beam is thin, and the cross beam is directly tapped through screws, so that the longitudinal beam and the cross beam are easily connected insecurely; furthermore, a part of second threaded holes are arranged and penetrate through the side wall of the limiting pin, so that the screws of the longitudinal beam are connected with the side wall of the cross beam and penetrate through the side wall of the cross beam, threaded connection between the screws and the limiting pin is realized, and on one hand, firm connection between the longitudinal beam and the cross beam is ensured; on the other hand, the reliability of the table leg mounting structure can be further improved, and the overall stability of the table is ensured.

As a further improvement of the above solution, the connecting portion includes a plurality of tubular flanges extending outwardly from the main body, and extending ends of the tubular flanges have chamfers; the cross beam comprises a plurality of transverse pipes arranged in parallel, and each transverse pipe is correspondingly matched with the tubular flange;

in order to improve the assembly efficiency of the cross beam and the joint, the connecting part is further provided with a tubular flange, and the tail end of the connecting part is provided with a chamfer, so that the pipe orifice of the transverse pipe is guided and sleeved on the joint, and the reliable connection of the mounting structure is ensured.

As a further improvement of the above aspect, the pin includes a head portion and a tail portion, and the radial width dimension of the head portion is greater than the radial width dimension of the tail portion;

the tail part of the pin is provided with external threads for connecting with the joint, and the outer end face of the head part of the pin is provided with a screwing structure matched with an installation tool so as to realize screwing in or screwing out of the pin and the joint by rotating the pin through the installation tool;

it should be noted that, when the traditional joint is connected with the cross beam, a transition fastening structure is needed, generally comprising a sliding block, a sliding seat, an adapter and the like, the structure is complex, and each part has high processing and manufacturing cost, which does not meet the requirement of large-scale production; furthermore, each connecting fastener of the table leg mounting structure has simple processing technology and strong interchangeability, and can effectively reduce the production cost; the cross beams and the foot tubes with a series of standard specifications can be manufactured according to production requirements, so that the standard production of the support is convenient to realize.

As a further improvement of the above scheme, when the pin is screwed in and fixedly connected with the joint, the inner end surface of the head of the pin is abutted with the end surface of the tubular flange;

the table leg mounting structure is exquisite in design, and ensures the overall coordination and attractiveness of the table by arranging the mutual matching of the pin and the limiting pin and hiding each fastener by means of the shielding of the cross beam and the joint; furthermore, the assembly of the pin and the joint connecting part of the installation structure is quite convenient, and the axial positioning of the pin can be realized by abutting the inner end surface of the pin with the end surface of the tubular flange through rotating the pin, so that the consistency and the stability of each installation structure are ensured.

As a further improvement of the above solution, the cross section of the tubular flange in the extending direction thereof is rectangular, trapezoidal or circular, and the inner wall of the transverse tube is adapted to the contour of the outer wall of the tubular flange.

As a further improvement of the scheme, a plurality of step parts are distributed on the limiting pin along the axial direction of the limiting pin, all transverse pipes are distributed at intervals by taking the step parts as boundaries, and the number of the transverse pipes is more than 1 than that of the step parts.

As a further improvement of the above scheme, the limit pin includes a first limit portion and a second limit portion, the step portion is disposed between the first limit portion and the second limit portion, each limit portion is cylindrical, the limit holes are distributed on each limit portion, and the step portion is square.

As a further improvement of the above scheme, the cross beam comprises a first transverse pipe and a second transverse pipe, each transverse pipe is provided with a through hole, and a first limiting part and a second limiting part of the limiting pin are respectively matched with the through holes of the first transverse pipe and the second transverse pipe correspondingly;

the upper end surface of the first limiting part is flush with the upper surface of the first transverse pipe, and the lower end surface of the second limiting part is flush with the lower surface of the second transverse pipe; the lower surface of the first horizontal pipe is abutted against the upper end face of the step part, and the upper surface of the second horizontal pipe is abutted against the lower end face of the step part.

As a further improvement of the above scheme, the through direction of the limiting hole is perpendicular to the extending direction of the first threaded hole, and the radial width dimension of the limiting pin is 1.2-1.8 times of the diameter dimension of the limiting hole;

it should be noted that the size of the limiting hole of the limiting pin needs to be reasonably configured, and when the diameter of the limiting hole is too large, the limiting pin needs to be correspondingly milled, which easily causes insufficient structural strength of the limiting pin; when the diameter of the limiting hole is too small, the specification and the size of the pin need to be correspondingly reduced, so that the overall connection stability is easy to be insufficient; furthermore, the mutual size relationship between the limiting pin and the limiting hole is determined through production practice and reasonable design, so that the connection reliability of the table leg mounting structure can be greatly improved.

The utility model has the advantages that:

(1) the structure is simple, the joints are respectively connected with the foot tubes and the cross beams, so that the cross beams and the foot tubes can be flexibly mounted and dismounted, the space occupancy rate is saved, and the transferring and storing capacity is greatly improved;

(2) the processing technology of each connecting fastener is simple, the interchangeability is strong, and the production cost can be effectively reduced; a series of beams and foot tubes with standard specifications can be manufactured according to production requirements, so that the standard production of the bracket is convenient to realize;

(3) the mutual matching of the pin and the limiting hole is arranged, the fastening screw is connected with the clamping and embedding of the pin hole, the corresponding limiting hole, the corresponding through hole and the like are adopted through the exquisite structural design, each fastener is hidden, and the overall harmony and the attractiveness of the table are kept.

Drawings

Fig. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of the connection of the joint and the pin of the present invention;

FIG. 3 is a schematic view of the connection between the cross tube and the limit pin of the present invention;

FIG. 4 is a schematic view of the connection between the pin and the limit pin according to the present invention;

FIG. 5 is a schematic view of the structure and installation of the stop pin of the present invention;

fig. 6 is a cross-sectional view of the present invention;

reference numerals:

1. a joint; 11. a connecting portion; 12. a pin pipe interface; q1, cavity; z1, body;

2. a cross beam; 21. a spacing pin; 211. a step portion; 212. a first limiting part; 213. a second limiting part; x1, a limiting hole; 22. a first cross tube; 23. a second cross tube; t1, vias;

3. a stringer; 31. a screw;

4. a foot tube;

5. a pin; 51. a head; 511. a pin hole; 512. screwing and assembling the structure; 52. a tail portion; d1, inner end surface; d2, outer end face;

6. a set screw;

l1, first threaded hole; l2, second threaded hole.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

As shown in fig. 1-6, a table leg mounting structure comprises a joint 1, wherein the joint 1 is respectively connected with a leg pipe 4 and a cross beam 2,

the joint 1 comprises a main body Z1 and a connecting part 11 arranged at the end face of the main body Z1, wherein the connecting part 11 comprises a plurality of tubular flanges, the tubular flanges extend outwards from the main body Z1, and the extending ends of the tubular flanges are provided with chamfers;

the port of the cross beam 2 is sleeved on the connecting part 11, specifically, the cross beam 2 comprises a plurality of horizontal pipes which are arranged in parallel, the cross section of the tubular flange in the extending direction is rectangular, the horizontal pipes are rectangular pipes, and each horizontal pipe is correspondingly matched with the tubular flange; in order to improve the assembly efficiency of the cross beam 2 and the joint 1, further, the connecting part 11 is provided with a tubular flange, and the tail end of the connecting part is provided with a chamfer, so that the guide is facilitated, the pipe orifice of the transverse pipe is sleeved on the joint 1, and the reliable connection of the mounting structure is ensured.

In a preferred embodiment, the cross section of the tubular flange in the direction of extension thereof can be trapezoidal or circular, the inner wall of the transverse tube fitting into the tubular flange.

The joint 1 further comprises a foot pipe interface 12, the foot pipe interface 12 is located on the other end face of the main body Z1, the main body Z1 is connected and fastened with the foot pipe 4 through the foot pipe interface 12, specifically, the middle of the main body Z1 is hollowed to form a cavity Q1, and the fastener passes through the cavity Q1 to penetrate through the foot pipe interface 12 and is fixedly connected with the foot pipe 4.

A plurality of pins 5 are fixedly connected to the connecting portion 11, the pins 5 extend outwards along the axial direction of the pins, pin holes 511 are formed in the side walls of the extending portions of the pins, and in this embodiment, the number of the tubular flanges of the connecting portion 11 and the number of the pins 5 are 2;

in the present embodiment, the stud 5 comprises a head portion 51 and a tail portion 52, the radial width dimension of the head portion 51 is greater than the radial width dimension of the tail portion 52; the tail part 52 of the pin 5 is provided with external threads for connecting with the joint 1, and the outer end surface D2 of the head part 51 of the pin 5 is provided with a screwing structure 512 for matching with an installation tool so as to realize screwing in or screwing out of the joint 1 by rotating the pin 5 through the installation tool; specifically, the screwing structure 512 is a regular hexagonal groove, a straight-line-shaped groove or a cross-shaped groove; the mounting tool can be a hexagonal wrench, a straight screwdriver or a cross screwdriver correspondingly.

It should be noted that, when the conventional joint 1 is connected with the beam 2, a transitional fastening structure is needed, which generally includes a slider, a sliding seat, an adapter and the like, the structure is complex, and each part has high processing and manufacturing cost, which does not meet the requirement of mass production; furthermore, each connecting fastener of the table leg mounting structure has simple processing technology and strong interchangeability, and can effectively reduce the production cost; the cross beams 2 and the foot tubes 4 with a series of standard specifications can be manufactured according to production requirements, so that the standard production of the support is convenient to realize.

In this embodiment, when the stud 5 is screwed into the joint 1, the inner end surface D1 of the head 51 of the stud 5 abuts against the tubular flange end surface; the table leg mounting structure is exquisite in design, and by arranging the mutual matching of the pin 5 and the limiting pin 21 and by means of the shielding of the cross beam 2 and the joint 1, all fasteners are hidden, so that the overall coordination and attractiveness of the table are ensured; furthermore, the assembly of the pin 5 and the connecting part 11 of the joint 1 of the mounting structure is quite convenient, and the axial positioning of the pin 5 can be realized by abutting the inner end surface D1 of the pin 5 with the end surface of the tubular flange through rotating the pin 5, so that the consistency and stability of each mounting structure are ensured.

A limiting pin 21 is arranged at a position, close to a port, of the cross beam 2, two ends of the limiting pin 21 penetrate through the side surface of the cross beam 2 respectively, first threaded holes L1 are formed in two end surfaces of the limiting pin 21 respectively, a plurality of limiting holes X1 are further formed in the side wall of the limiting pin 21, the limiting holes X1 correspond to the pins 5, and the first threaded holes L1 are communicated with the limiting holes X1; in the embodiment, the penetrating direction of the limiting hole X1 is perpendicular to the extending direction of the first threaded hole L1, and the radial width dimension of the limiting pin 21 is 1.2 to 1.8 times the diameter dimension of the limiting hole X1; it should be noted that, the size of the limit hole X1 of the limit pin 21 needs to be configured reasonably, and when the diameter of the limit hole X1 is too large, the limit pin 21 needs to be milled correspondingly, which is likely to cause insufficient structural strength of the limit pin 21; when the diameter of the limiting hole X1 is too small, the specification and the size of the pin 5 need to be correspondingly reduced, so that the overall connection stability is easy to be insufficient; furthermore, the mutual size relationship between the limiting pin 21 and the limiting hole X1 is determined through production practice and reasonable design, so that the connection reliability of the table leg mounting structure can be greatly improved.

When the cross beam 2 is connected with the joint 1, the pin 5 extends into a limiting hole X1 of the limiting pin 21, a pin hole 511 on the pin 5 is arranged opposite to the first threaded hole L1, the connector further comprises a set screw 6, and the set screw 6 is screwed from outside to inside from the first threaded hole L1 and is mutually clamped and embedded with the pin hole 511 of the pin 5;

in this embodiment, the limiting pin 21 has a plurality of step portions 211 distributed along the axial direction thereof, each horizontal tube is distributed at intervals with the step portions 211 as a boundary, the number of the horizontal tubes is 1 more than that of the step portions 211, specifically, the limiting pin 21 includes a first limiting portion 212 and a second limiting portion 213, the step portions 211 are arranged between the first limiting portion and the second limiting portion, each limiting portion is cylindrical, the limiting holes X1 are distributed on each limiting portion, and the step portions 211 are square.

In this embodiment, the cross beam 2 includes a first horizontal tube 22 and a second horizontal tube 23, each horizontal tube is provided with a through hole T1, and the first limiting portion 212 and the second limiting portion 213 of the limiting pin 21 are respectively matched with the through holes T1 of the first horizontal tube 22 and the second horizontal tube 23;

the upper end surface of the first limiting part 212 is flush with the upper surface of the first horizontal pipe 22, and the lower end surface of the second limiting part 213 is flush with the lower surface of the second horizontal pipe 23; the lower surface of the first horizontal pipe 22 is abutted with the upper end surface of the step part 211, and the upper surface of the second horizontal pipe 23 is abutted with the lower end surface of the step part 211; in the embodiment, the first transverse tube 22, the second transverse tube 23 and the limit pin 21 are fixedly connected into a whole by welding to form the cross beam 2 so as to be fast sleeved with the connecting part 11 of the joint 1.

In this embodiment, the device further comprises a longitudinal beam 3, the cross beam 2 is provided with a plurality of second threaded holes L2 penetrating through the side surface, and the longitudinal beam 3 is fixedly connected with the second threaded holes L2 of the cross beam 2 through screws 31; a part of the second threaded hole L2 simultaneously penetrates through the side wall of the stopper pin 21, and the screw 31 extending into the part of the second threaded hole L2 is in threaded connection with the stopper pin 21.

It should be noted that the wall thickness of the cross beam 2 is thin, and the screw 31 directly taps the cross beam 2, which easily causes the connection between the longitudinal beam 3 and the cross beam 2 to be insecure; furthermore, a part of the second threaded holes L2 are arranged to penetrate through the side wall of the limit pin 21, so that the screws 31 of the longitudinal beam 3 are connected with the side wall of the cross beam 2 and penetrate through the side wall of the cross beam 2, and the screws 31 are in threaded connection with the limit pin 21, thereby ensuring firm connection between the longitudinal beam 3 and the cross beam 2; on the other hand, the reliability of the table leg mounting structure can be further improved, and the overall stability of the table is ensured.

Through the above technical scheme of the utility model, in the concrete application, firstly, the pin tube interface 12 of the joint 1 is connected and fastened with the pin tube 4, and the pin 5 is screwed into the main body Z1 part of the joint 1 by using the installation tool, so that the inner end surface D1 of the head 51 of the pin 5 is abutted against the end surface of the tubular flange, and the axial positioning of the pin 5 is completed;

secondly, the pipe orifice of the transverse pipe of the cross beam 2 is sleeved with the tubular flange of the connecting part 11, so that the head part 51 of the pin 5 extends into a limiting hole X1 of the limiting pin 21, at the moment, the pin hole 511 of the head part 51 of the pin 5 is arranged right opposite to the first threaded hole L1, the fastening screw 6 is rotated from outside to inside and is mutually clamped and matched with the pin hole 511 of the pin 5, and the stable connection of the cross beam 2 and the joint 1 is realized;

in addition, the longitudinal beam 3 is fixedly connected with a second threaded hole L2 of the cross beam 2 through a screw 31; part second screw hole L2 runs through the lateral wall of spacer pin 21 simultaneously, stretches into this part second screw hole L2's screw 31 and spacer pin 21 threaded connection, further improves the reliability of table foot mounting structure, has guaranteed the overall stability of desk. This table foot mounting structure connects 1 to link to each other with foot pipe 4, crossbeam 2 respectively through setting up, and is concrete, sets up mutually supporting of pin 5 and spacing hole X1 to and holding screw 6 is connected with the inlay card of pinhole 511, realizes the nimble installation and the dismantlement of crossbeam 2 and foot pipe 4, and structural design is exquisite, can effectively improve the rate of utilization of space, guarantees holistic harmony and the aesthetic property of desk.

Variations and modifications to the above-described embodiments may occur to those skilled in the art, in light of the above teachings and teachings. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the present invention should fall within the protection scope of the claims of the present invention. Furthermore, although specific terms are employed herein, such terms are used for convenience of description and are not to be construed as limiting the invention in any way.

Claims (10)

1. The utility model provides a mounting structure of table foot, includes the joint, connect respectively with foot pipe, crossbeam and link to each other its characterized in that:

the joint comprises a main body and a connecting part arranged on the end face of the main body, wherein a plurality of pins are fixedly connected to the connecting part, the pins extend outwards along the axial direction of the pins, and pin holes are formed in the side wall of the extending part of the pins;

the end opening of the cross beam is sleeved on the connecting part, a limiting pin is arranged on the cross beam close to the end opening, two ends of the limiting pin penetrate through the side surface of the cross beam respectively, first threaded holes are formed in two end surfaces of the limiting pin respectively, a plurality of limiting holes are formed in the side wall of the limiting pin and correspond to the pin, and the first threaded holes are communicated with the limiting holes;

when the cross beam is connected with the joint, the pin extends into the limiting hole of the limiting pin, the pin hole in the pin is arranged right opposite to the first threaded hole, and the pin further comprises a set screw, and the set screw is screwed in from the first threaded hole from outside to inside and is mutually clamped and embedded with the pin hole of the pin.

2. The mounting structure according to claim 1, further comprising a longitudinal beam, wherein the transverse beam is provided with a plurality of second threaded holes penetrating through the side surface, and the longitudinal beam is fixedly connected with the second threaded holes of the transverse beam through screws; and part of the second threaded holes simultaneously penetrate through the side wall of the limiting pin, and screws extending into the part of the second threaded holes are in threaded connection with the limiting pin.

3. The mounting structure according to claim 1 or 2, wherein the connecting portion includes a plurality of tubular flanges extending outwardly from the main body, the extending ends of which have chamfers; the cross beam comprises a plurality of transverse pipes arranged in parallel, and each transverse pipe is correspondingly matched with the tubular flange.

4. The mounting structure of claim 3, wherein the stud includes a head portion and a tail portion, the head portion having a radial width dimension greater than a radial width dimension of the tail portion;

the pin afterbody is equipped with the external screw thread for with connect and be connected, the outer terminal surface of pin head be equipped with be used for with mounting tool complex twist dress structure, in order to realize through the rotatory pin of mounting tool with the screw in or screw out of joint.

5. A mounting arrangement according to claim 4, characterised in that the inner end surface of the stud head abuts the end surface of the tubular flange when the stud is screwed into engagement with the joint.

6. A mounting arrangement according to claim 3, characterised in that the tubular flange is rectangular, trapezoidal or circular in cross-section in the direction of its extent, the inner wall of the cross tube being adapted to the contour of the outer wall of the tubular flange.

7. The mounting structure according to claim 6, wherein the limit pin is distributed with a plurality of step parts along the axial direction, each horizontal tube is distributed at intervals by taking the step parts as boundaries, and the number of the horizontal tubes is 1 more than that of the step parts.

8. The mounting structure according to claim 7, wherein the stopper pin includes a first stopper portion and a second stopper portion, the step portion is provided therebetween, each stopper portion is cylindrical, the stopper holes are distributed on each stopper portion, and the step portion is square.

9. The mounting structure according to claim 8, wherein the cross beam comprises a first transverse pipe and a second transverse pipe, each transverse pipe is provided with a through hole, and a first limiting part and a second limiting part of the limiting pin are correspondingly matched with the through holes of the first transverse pipe and the second transverse pipe respectively;

the upper end surface of the first limiting part is level with the upper surface of the first transverse pipe, and the lower end surface of the second limiting part is level with the lower surface of the second transverse pipe; the lower surface of the first horizontal pipe is abutted against the upper end face of the step part, and the upper surface of the second horizontal pipe is abutted against the lower end face of the step part.

10. The mounting structure according to claim 1 or 2, wherein a penetrating direction of the stopper hole is perpendicular to an extending direction of the first threaded hole, and a radial width dimension of the stopper pin is 1.2 to 1.8 times a diameter dimension of the stopper hole.

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